<?php   
header("Content-type:text/html; charset=UTF-8");        
header("Cache-Control: no-store, no-cache, must-revalidate");       
header("Cache-Control: post-check=0, pre-check=0", false);       
if($_GET['rev']==1){
	echo date("Y-m-d H:i:s");
	exit;
}
?>